London Underground’s director of strategy Gareth Powell said: “We are investing billions of pounds redeveloping London Underground and London Overground stations to make them step-free with 25 confirmed schemes over the next decade, but unfortunately we need extra funding to do more.

“Finding the space and changing the infrastructure at stations to construct lift shafts as well as installing very robust lifts is extremely expensive.

“We are trying to achieve even more accessible stations wherever possible with third party funding.